var debug = false;
var EXIF = function (obj) {
    if (obj instanceof EXIF) return obj;
    if (!(this instanceof EXIF)) return new EXIF(obj);
    this.EXIFwrapped = obj;
};
var ExifTags = EXIF.Tags = {

    // version tags
    0x9000: 'ExifVersion', // EXIF version
    0xA000: 'FlashpixVersion', // Flashpix format version

    // colorspace tags
    0xA001: 'ColorSpace', // Color space information tag

    // image configuration
    0xA002: 'PixelXDimension', // Valid width of meaningful image
    0xA003: 'PixelYDimension', // Valid height of meaningful image
    0x9101: 'ComponentsConfiguration', // Information about channels
    0x9102: 'CompressedBitsPerPixel', // Compressed bits per pixel

    // user information
    0x927C: 'MakerNote', // Any desired information written by the manufacturer
    0x9286: 'UserComment', // Comments by user

    // related file
    0xA004: 'RelatedSoundFile', // Name of related sound file

    // date and time
    0x9003: 'DateTimeOriginal', // Date and time when the original image was generated
    0x9004: 'DateTimeDigitized', // Date and time when the image was stored digitally
    0x9290: 'SubsecTime', // Fractions of seconds for DateTime
    0x9291: 'SubsecTimeOriginal', // Fractions of seconds for DateTimeOriginal
    0x9292: 'SubsecTimeDigitized', // Fractions of seconds for DateTimeDigitized

    // picture-taking conditions
    0x829A: 'ExposureTime', // Exposure time (in seconds)
    0x829D: 'FNumber', // F number
    0x8822: 'ExposureProgram', // Exposure program
    0x8824: 'SpectralSensitivity', // Spectral sensitivity
    0x8827: 'ISOSpeedRatings', // ISO speed rating
    0x8828: 'OECF', // Optoelectric conversion factor
    0x9201: 'ShutterSpeedValue', // Shutter speed
    0x9202: 'ApertureValue', // Lens aperture
    0x9203: 'BrightnessValue', // Value of brightness
    0x9204: 'ExposureBias', // Exposure bias
    0x9205: 'MaxApertureValue', // Smallest F number of lens
    0x9206: 'SubjectDistance', // Distance to subject in meters
    0x9207: 'MeteringMode', // Metering mode
    0x9208: 'LightSource', // Kind of light source
    0x9209: 'Flash', // Flash status
    0x9214: 'SubjectArea', // Location and area of main subject
    0x920A: 'FocalLength', // Focal length of the lens in mm
    0xA20B: 'FlashEnergy', // Strobe energy in BCPS
    0xA20C: 'SpatialFrequencyResponse', //
    0xA20E: 'FocalPlaneXResolution', // Number of pixels in width direction per FocalPlaneResolutionUnit
    0xA20F: 'FocalPlaneYResolution', // Number of pixels in height direction per FocalPlaneResolutionUnit
    0xA210: 'FocalPlaneResolutionUnit', // Unit for measuring FocalPlaneXResolution and FocalPlaneYResolution
    0xA214: 'SubjectLocation', // Location of subject in image
    0xA215: 'ExposureIndex', // Exposure index selected on camera
    0xA217: 'SensingMethod', // Image sensor type
    0xA300: 'FileSource', // Image source (3 == DSC)
    0xA301: 'SceneType', // Scene type (1 == directly photographed)
    0xA302: 'CFAPattern', // Color filter array geometric pattern
    0xA401: 'CustomRendered', // Special processing
    0xA402: 'ExposureMode', // Exposure mode
    0xA403: 'WhiteBalance', // 1 = auto white balance, 2 = manual
    0xA404: 'DigitalZoomRation', // Digital zoom ratio
    0xA405: 'FocalLengthIn35mmFilm', // Equivalent foacl length assuming 35mm film camera (in mm)
    0xA406: 'SceneCaptureType', // Type of scene
    0xA407: 'GainControl', // Degree of overall image gain adjustment
    0xA408: 'Contrast', // Direction of contrast processing applied by camera
    0xA409: 'Saturation', // Direction of saturation processing applied by camera
    0xA40A: 'Sharpness', // Direction of sharpness processing applied by camera
    0xA40B: 'DeviceSettingDescription', //
    0xA40C: 'SubjectDistanceRange', // Distance to subject

    // other tags
    0xA005: 'InteroperabilityIFDPointer',
    0xA420: 'ImageUniqueID' // Identifier assigned uniquely to each image
};

var TiffTags = EXIF.TiffTags = {
    0x0100: 'ImageWidth',
    0x0101: 'ImageHeight',
    0x8769: 'ExifIFDPointer',
    0x8825: 'GPSInfoIFDPointer',
    0xA005: 'InteroperabilityIFDPointer',
    0x0102: 'BitsPerSample',
    0x0103: 'Compression',
    0x0106: 'PhotometricInterpretation',
    0x0112: 'Orientation',
    0x0115: 'SamplesPerPixel',
    0x011C: 'PlanarConfiguration',
    0x0212: 'YCbCrSubSampling',
    0x0213: 'YCbCrPositioning',
    0x011A: 'XResolution',
    0x011B: 'YResolution',
    0x0128: 'ResolutionUnit',
    0x0111: 'StripOffsets',
    0x0116: 'RowsPerStrip',
    0x0117: 'StripByteCounts',
    0x0201: 'JPEGInterchangeFormat',
    0x0202: 'JPEGInterchangeFormatLength',
    0x012D: 'TransferFunction',
    0x013E: 'WhitePoint',
    0x013F: 'PrimaryChromaticities',
    0x0211: 'YCbCrCoefficients',
    0x0214: 'ReferenceBlackWhite',
    0x0132: 'DateTime',
    0x010E: 'ImageDescription',
    0x010F: 'Make',
    0x0110: 'Model',
    0x0131: 'Software',
    0x013B: 'Artist',
    0x8298: 'Copyright'
};

var GPSTags = EXIF.GPSTags = {
    0x0000: 'GPSVersionID',
    0x0001: 'GPSLatitudeRef',
    0x0002: 'GPSLatitude',
    0x0003: 'GPSLongitudeRef',
    0x0004: 'GPSLongitude',
    0x0005: 'GPSAltitudeRef',
    0x0006: 'GPSAltitude',
    0x0007: 'GPSTimeStamp',
    0x0008: 'GPSSatellites',
    0x0009: 'GPSStatus',
    0x000A: 'GPSMeasureMode',
    0x000B: 'GPSDOP',
    0x000C: 'GPSSpeedRef',
    0x000D: 'GPSSpeed',
    0x000E: 'GPSTrackRef',
    0x000F: 'GPSTrack',
    0x0010: 'GPSImgDirectionRef',
    0x0011: 'GPSImgDirection',
    0x0012: 'GPSMapDatum',
    0x0013: 'GPSDestLatitudeRef',
    0x0014: 'GPSDestLatitude',
    0x0015: 'GPSDestLongitudeRef',
    0x0016: 'GPSDestLongitude',
    0x0017: 'GPSDestBearingRef',
    0x0018: 'GPSDestBearing',
    0x0019: 'GPSDestDistanceRef',
    0x001A: 'GPSDestDistance',
    0x001B: 'GPSProcessingMethod',
    0x001C: 'GPSAreaInformation',
    0x001D: 'GPSDateStamp',
    0x001E: 'GPSDifferential'
};

var StringValues = EXIF.StringValues = {
    ExposureProgram: {
        0: 'Not defined',
        1: 'Manual',
        2: 'Normal program',
        3: 'Aperture priority',
        4: 'Shutter priority',
        5: 'Creative program',
        6: 'Action program',
        7: 'Portrait mode',
        8: 'Landscape mode'
    },
    MeteringMode: {
        0: 'Unknown',
        1: 'Average',
        2: 'CenterWeightedAverage',
        3: 'Spot',
        4: 'MultiSpot',
        5: 'Pattern',
        6: 'Partial',
        255: 'Other'
    },
    LightSource: {
        0: 'Unknown',
        1: 'Daylight',
        2: 'Fluorescent',
        3: 'Tungsten (incandescent light)',
        4: 'Flash',
        9: 'Fine weather',
        10: 'Cloudy weather',
        11: 'Shade',
        12: 'Daylight fluorescent (D 5700 - 7100K)',
        13: 'Day white fluorescent (N 4600 - 5400K)',
        14: 'Cool white fluorescent (W 3900 - 4500K)',
        15: 'White fluorescent (WW 3200 - 3700K)',
        17: 'Standard light A',
        18: 'Standard light B',
        19: 'Standard light C',
        20: 'D55',
        21: 'D65',
        22: 'D75',
        23: 'D50',
        24: 'ISO studio tungsten',
        255: 'Other'
    },
    Flash: {
        0x0000: 'Flash did not fire',
        0x0001: 'Flash fired',
        0x0005: 'Strobe return light not detected',
        0x0007: 'Strobe return light detected',
        0x0009: 'Flash fired, compulsory flash mode',
        0x000D: 'Flash fired, compulsory flash mode, return light not detected',
        0x000F: 'Flash fired, compulsory flash mode, return light detected',
        0x0010: 'Flash did not fire, compulsory flash mode',
        0x0018: 'Flash did not fire, auto mode',
        0x0019: 'Flash fired, auto mode',
        0x001D: 'Flash fired, auto mode, return light not detected',
        0x001F: 'Flash fired, auto mode, return light detected',
        0x0020: 'No flash function',
        0x0041: 'Flash fired, red-eye reduction mode',
        0x0045: 'Flash fired, red-eye reduction mode, return light not detected',
        0x0047: 'Flash fired, red-eye reduction mode, return light detected',
        0x0049: 'Flash fired, compulsory flash mode, red-eye reduction mode',
        0x004D: 'Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected',
        0x004F: 'Flash fired, compulsory flash mode, red-eye reduction mode, return light detected',
        0x0059: 'Flash fired, auto mode, red-eye reduction mode',
        0x005D: 'Flash fired, auto mode, return light not detected, red-eye reduction mode',
        0x005F: 'Flash fired, auto mode, return light detected, red-eye reduction mode'
    },
    SensingMethod: {
        1: 'Not defined',
        2: 'One-chip color area sensor',
        3: 'Two-chip color area sensor',
        4: 'Three-chip color area sensor',
        5: 'Color sequential area sensor',
        7: 'Trilinear sensor',
        8: 'Color sequential linear sensor'
    },
    SceneCaptureType: {
        0: 'Standard',
        1: 'Landscape',
        2: 'Portrait',
        3: 'Night scene'
    },
    SceneType: {
        1: 'Directly photographed'
    },
    CustomRendered: {
        0: 'Normal process',
        1: 'Custom process'
    },
    WhiteBalance: {
        0: 'Auto white balance',
        1: 'Manual white balance'
    },
    GainControl: {
        0: 'None',
        1: 'Low gain up',
        2: 'High gain up',
        3: 'Low gain down',
        4: 'High gain down'
    },
    Contrast: {
        0: 'Normal',
        1: 'Soft',
        2: 'Hard'
    },
    Saturation: {
        0: 'Normal',
        1: 'Low saturation',
        2: 'High saturation'
    },
    Sharpness: {
        0: 'Normal',
        1: 'Soft',
        2: 'Hard'
    },
    SubjectDistanceRange: {
        0: 'Unknown',
        1: 'Macro',
        2: 'Close view',
        3: 'Distant view'
    },
    FileSource: {
        3: 'DSC'
    },

    Components: {
        0: '',
        1: 'Y',
        2: 'Cb',
        3: 'Cr',
        4: 'R',
        5: 'G',
        6: 'B'
    }
};

function imageHasData (img) {
    return !!(img.exifdata);
}

function base64ToArrayBuffer (base64, contentType) {
    contentType = contentType || base64.match(/^data\:([^\;]+)\;base64,/mi)[1] || ''; // e.g. 'data:image/jpeg;base64,...' => 'image/jpeg'
    base64 = base64.replace(/^data\:([^\;]+)\;base64,/gmi, '');
    var binary = atob(base64);
    var len = binary.length;
    var buffer = new ArrayBuffer(len);
    var view = new Uint8Array(buffer);
    for (var i = 0;i < len;i++) {
        view[i] = binary.charCodeAt(i);
    }
    return buffer;
}

function objectURLToBlob (url, callback) {
    var http = new XMLHttpRequest();
    http.open('GET', url, true);
    http.responseType = 'blob';
    http.onload = function (e) {
        if (this.status === 200 || this.status === 0) {
            callback(this.response);
        }
    };
    http.send();
}

function getImageData (img, callback) {
    function handleBinaryFile (binFile) {
        var data = findEXIFinJPEG(binFile);
        var iptcdata = findIPTCinJPEG(binFile);
        img.exifdata = data || {};
        img.iptcdata = iptcdata || {};
        if (callback) {
            callback.call(img);
        }
    }

    if (img.src) {
        if (/^data\:/i.test(img.src)) { // Data URI
            var arrayBuffer = base64ToArrayBuffer(img.src);
            handleBinaryFile(arrayBuffer);
        } else if (/^blob\:/i.test(img.src)) { // Object URL
            var fileReader = new FileReader();
            fileReader.onload = function (e) {
                handleBinaryFile(e.target.result);
            };
            objectURLToBlob(img.src, function (blob) {
                fileReader.readAsArrayBuffer(blob);
            });
        } else {
            var http = new XMLHttpRequest();
            http.onload = function () {
                if (this.status === 200 || this.status === 0) {
                    handleBinaryFile(http.response);
                }
                http = null;
            };
            http.open('GET', img.src, true);
            http.responseType = 'arraybuffer';
            http.send(null);
        }
    } else if (window.FileReader && (img instanceof window.Blob || img instanceof window.File)) {
        var fileReader2 = new FileReader();
        fileReader2.onload = function (e) {
            if (debug) console.log('Got file of length ' + e.target.result.byteLength);
            handleBinaryFile(e.target.result);
        };
        fileReader2.readAsArrayBuffer(img);
    }
}

function findEXIFinJPEG (file) {
    var dataView = new DataView(file);

    if (debug) console.log('Got file of length ' + file.byteLength);
    if ((dataView.getUint8(0) !== 0xFF) || (dataView.getUint8(1) !== 0xD8)) {
        if (debug) console.log('Not a valid JPEG');
        return false; // not a valid jpeg
    }

    var offset = 2,
        length = file.byteLength,
        marker;

    while (offset < length) {
        if (dataView.getUint8(offset) !== 0xFF) {
            if (debug) console.log('Not a valid marker at offset ' + offset + ', found: ' + dataView.getUint8(offset));
            return false; // not a valid marker, something is wrong
        }

        marker = dataView.getUint8(offset + 1);
        if (debug) console.log(marker);

        // we could implement handling for other markers here,
        // but we're only looking for 0xFFE1 for EXIF data

        if (marker === 225) {
            if (debug) console.log('Found 0xFFE1 marker');

            return readEXIFData(dataView, offset + 4, dataView.getUint16(offset + 2) - 2);

            // offset += 2 + file.getShortAt(offset+2, true);
        } else {
            offset += 2 + dataView.getUint16(offset + 2);
        }
    }
}

function findIPTCinJPEG (file) {
    var dataView = new DataView(file);

    if (debug) console.log('Got file of length ' + file.byteLength);
    if ((dataView.getUint8(0) !== 0xFF) || (dataView.getUint8(1) !== 0xD8)) {
        if (debug) console.log('Not a valid JPEG');
        return false; // not a valid jpeg
    }

    var offset = 2,
        length = file.byteLength;

    var isFieldSegmentStart = function (dataView, offset) {
        return (
            dataView.getUint8(offset) === 0x38 &&
                dataView.getUint8(offset + 1) === 0x42 &&
                dataView.getUint8(offset + 2) === 0x49 &&
                dataView.getUint8(offset + 3) === 0x4D &&
                dataView.getUint8(offset + 4) === 0x04 &&
                dataView.getUint8(offset + 5) === 0x04
        );
    };

    while (offset < length) {
        if (isFieldSegmentStart(dataView, offset)) {
            // Get the length of the name header (which is padded to an even number of bytes)
            var nameHeaderLength = dataView.getUint8(offset + 7);
            if (nameHeaderLength % 2 !== 0) nameHeaderLength += 1;
            // Check for pre photoshop 6 format
            if (nameHeaderLength === 0) {
                // Always 4
                nameHeaderLength = 4;
            }

            var startOffset = offset + 8 + nameHeaderLength;
            var sectionLength = dataView.getUint16(offset + 6 + nameHeaderLength);

            return readIPTCData(file, startOffset, sectionLength);
        }

        // Not the marker, continue searching
        offset++;
    }
}
var IptcFieldMap = {
    0x78: 'caption',
    0x6E: 'credit',
    0x19: 'keywords',
    0x37: 'dateCreated',
    0x50: 'byline',
    0x55: 'bylineTitle',
    0x7A: 'captionWriter',
    0x69: 'headline',
    0x74: 'copyright',
    0x0F: 'category'
};
function readIPTCData (file, startOffset, sectionLength) {
    var dataView = new DataView(file);
    var data = {};
    var fieldValue, fieldName, dataSize, segmentType;
    var segmentStartPos = startOffset;
    while (segmentStartPos < startOffset + sectionLength) {
        if (dataView.getUint8(segmentStartPos) === 0x1C && dataView.getUint8(segmentStartPos + 1) === 0x02) {
            segmentType = dataView.getUint8(segmentStartPos + 2);
            if (segmentType in IptcFieldMap) {
                dataSize = dataView.getInt16(segmentStartPos + 3);
                fieldName = IptcFieldMap[segmentType];
                fieldValue = getStringFromDB(dataView, segmentStartPos + 5, dataSize);
                // Check if we already stored a value with this name
                if (data.hasOwnProperty(fieldName)) {
                    // Value already stored with this name, create multivalue field
                    if (data[fieldName] instanceof Array) {
                        data[fieldName].push(fieldValue);
                    } else {
                        data[fieldName] = [data[fieldName], fieldValue];
                    }
                } else {
                    data[fieldName] = fieldValue;
                }
            }
        }
        segmentStartPos++;
    }
    return data;
}

function readTags (file, tiffStart, dirStart, strings, bigEnd) {
    var entries = file.getUint16(dirStart, !bigEnd),
        tags = {},
        entryOffset, tag,
        i;

    for (i = 0;i < entries;i++) {
        entryOffset = dirStart + i * 12 + 2;
        tag = strings[file.getUint16(entryOffset, !bigEnd)];
        if (!tag && debug) console.log('Unknown tag: ' + file.getUint16(entryOffset, !bigEnd));
        tags[tag] = readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd);
    }
    return tags;
}

function readTagValue (file, entryOffset, tiffStart, dirStart, bigEnd) {
    var type = file.getUint16(entryOffset + 2, !bigEnd),
        numValues = file.getUint32(entryOffset + 4, !bigEnd),
        valueOffset = file.getUint32(entryOffset + 8, !bigEnd) + tiffStart,
        offset,
        vals, val, n,
        numerator, denominator;

    switch (type) {
    case 1: // byte, 8-bit unsigned int
    case 7: // undefined, 8-bit byte, value depending on field
        if (numValues === 1) {
            return file.getUint8(entryOffset + 8, !bigEnd);
        } else {
            offset = numValues > 4 ? valueOffset : (entryOffset + 8);
            vals = [];
            for (n = 0;n < numValues;n++) {
                vals[n] = file.getUint8(offset + n);
            }
            return vals;
        }

    case 2: // ascii, 8-bit byte
        offset = numValues > 4 ? valueOffset : (entryOffset + 8);
        return getStringFromDB(file, offset, numValues - 1);

    case 3: // short, 16 bit int
        if (numValues === 1) {
            return file.getUint16(entryOffset + 8, !bigEnd);
        } else {
            offset = numValues > 2 ? valueOffset : (entryOffset + 8);
            vals = [];
            for (n = 0;n < numValues;n++) {
                vals[n] = file.getUint16(offset + 2 * n, !bigEnd);
            }
            return vals;
        }

    case 4: // long, 32 bit int
        if (numValues === 1) {
            return file.getUint32(entryOffset + 8, !bigEnd);
        } else {
            vals = [];
            for (n = 0;n < numValues;n++) {
                vals[n] = file.getUint32(valueOffset + 4 * n, !bigEnd);
            }
            return vals;
        }

    case 5: // rational = two long values, first is numerator, second is denominator
        if (numValues === 1) {
            numerator = file.getUint32(valueOffset, !bigEnd);
            denominator = file.getUint32(valueOffset + 4, !bigEnd);
            val = new Number(numerator / denominator);  //eslint-disable-line
            val.numerator = numerator;
            val.denominator = denominator;
            return val;
        } else {
            vals = [];
            for (n = 0;n < numValues;n++) {
                numerator = file.getUint32(valueOffset + 8 * n, !bigEnd);
                denominator = file.getUint32(valueOffset + 4 + 8 * n, !bigEnd);
                vals[n] = new Number(numerator / denominator);//eslint-disable-line
                vals[n].numerator = numerator;
                vals[n].denominator = denominator;
            }
            return vals;
        }

    case 9: // slong, 32 bit signed int
        if (numValues === 1) {
            return file.getInt32(entryOffset + 8, !bigEnd);
        } else {
            vals = [];
            for (n = 0;n < numValues;n++) {
                vals[n] = file.getInt32(valueOffset + 4 * n, !bigEnd);
            }
            return vals;
        }

    case 10: // signed rational, two slongs, first is numerator, second is denominator
        if (numValues === 1) {
            return file.getInt32(valueOffset, !bigEnd) / file.getInt32(valueOffset + 4, !bigEnd);
        } else {
            vals = [];
            for (n = 0;n < numValues;n++) {
                vals[n] = file.getInt32(valueOffset + 8 * n, !bigEnd) / file.getInt32(valueOffset + 4 + 8 * n, !bigEnd);
            }
            return vals;
        }
    }
}

function getStringFromDB (buffer, start, length) {
    var outstr = '';
    for (var n = start;n < start + length;n++) {
        outstr += String.fromCharCode(buffer.getUint8(n));
    }
    return outstr;
}

function readEXIFData (file, start) {
    if (getStringFromDB(file, start, 4) !== 'Exif') {
        if (debug) console.log('Not valid EXIF data! ' + getStringFromDB(file, start, 4));
        return false;
    }

    var bigEnd,
        tags, tag,
        exifData, gpsData,
        tiffOffset = start + 6;

        // test for TIFF validity and endianness
    if (file.getUint16(tiffOffset) === 0x4949) {
        bigEnd = false;
    } else if (file.getUint16(tiffOffset) === 0x4D4D) {
        bigEnd = true;
    } else {
        if (debug) console.log('Not valid TIFF data! (no 0x4949 or 0x4D4D)');
        return false;
    }

    if (file.getUint16(tiffOffset + 2, !bigEnd) !== 0x002A) {
        if (debug) console.log('Not valid TIFF data! (no 0x002A)');
        return false;
    }

    var firstIFDOffset = file.getUint32(tiffOffset + 4, !bigEnd);

    if (firstIFDOffset < 0x00000008) {
        if (debug) console.log('Not valid TIFF data! (First offset less than 8)', file.getUint32(tiffOffset + 4, !bigEnd));
        return false;
    }

    tags = readTags(file, tiffOffset, tiffOffset + firstIFDOffset, TiffTags, bigEnd);

    if (tags.ExifIFDPointer) {
        exifData = readTags(file, tiffOffset, tiffOffset + tags.ExifIFDPointer, ExifTags, bigEnd);
        for (tag in exifData) {
            switch (tag) {
            case 'LightSource' :
            case 'Flash' :
            case 'MeteringMode' :
            case 'ExposureProgram' :
            case 'SensingMethod' :
            case 'SceneCaptureType' :
            case 'SceneType' :
            case 'CustomRendered' :
            case 'WhiteBalance' :
            case 'GainControl' :
            case 'Contrast' :
            case 'Saturation' :
            case 'Sharpness' :
            case 'SubjectDistanceRange' :
            case 'FileSource' :
                exifData[tag] = StringValues[tag][exifData[tag]];
                break;

            case 'ExifVersion' :
            case 'FlashpixVersion' :
                exifData[tag] = String.fromCharCode(exifData[tag][0], exifData[tag][1], exifData[tag][2], exifData[tag][3]);
                break;

            case 'ComponentsConfiguration' :
                exifData[tag] =
                            StringValues.Components[exifData[tag][0]] +
                            StringValues.Components[exifData[tag][1]] +
                            StringValues.Components[exifData[tag][2]] +
                            StringValues.Components[exifData[tag][3]];
                break;
            }
            tags[tag] = exifData[tag];
        }
    }

    if (tags.GPSInfoIFDPointer) {
        gpsData = readTags(file, tiffOffset, tiffOffset + tags.GPSInfoIFDPointer, GPSTags, bigEnd);
        for (tag in gpsData) {
            switch (tag) {
            case 'GPSVersionID' :
                gpsData[tag] = gpsData[tag][0] +
                            '.' + gpsData[tag][1] +
                            '.' + gpsData[tag][2] +
                            '.' + gpsData[tag][3];
                break;
            }
            tags[tag] = gpsData[tag];
        }
    }

    return tags;
}

EXIF.getData = function (img, callback) {
    if ((img instanceof Image || img instanceof HTMLImageElement) && !img.complete) return false;

    if (!imageHasData(img)) {
        getImageData(img, callback);
    } else {
        if (callback) {
            callback.call(img);
        }
    }
    return true;
};

EXIF.getTag = function (img, tag) {
    if (!imageHasData(img)) return;
    return img.exifdata[tag];
};

EXIF.getAllTags = function (img) {
    if (!imageHasData(img)) return {};
    var a,
        data = img.exifdata,
        tags = {};
    for (a in data) {
        if (data.hasOwnProperty(a)) {
            tags[a] = data[a];
        }
    }
    return tags;
};

EXIF.pretty = function (img) {
    if (!imageHasData(img)) return '';
    var a,
        data = img.exifdata,
        strPretty = '';
    for (a in data) {
        if (data.hasOwnProperty(a)) {
            if (typeof data[a] === 'object') {
                if (data[a] instanceof Number) {
                    strPretty += a + ' : ' + data[a] + ' [' + data[a].numerator + '/' + data[a].denominator + ']\r\n';
                } else {
                    strPretty += a + ' : [' + data[a].length + ' values]\r\n';
                }
            } else {
                strPretty += a + ' : ' + data[a] + '\r\n';
            }
        }
    }
    return strPretty;
};
EXIF.readFromBinaryFile = function (file) {
    return findEXIFinJPEG(file);
};
export default EXIF;
